SnO<sub>2</sub> -in-Polymer Matrix for High-Efficiency Perovskite Solar Cells with Improved Reproducibility and Stability.
basic_science · Level V
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- Record sourced from PubMed, PMID 30387272.
- Also identified by DOI 10.1002/adma.201805153.
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Abstract
Understanding interfacial loss and the ways to improving interfacial property is critical to fabricate highly efficient and reproducible perovskite solar cells (PSCs). In SnO<sub>2</sub> -based PSCs, nonradiative recombination sites at the SnO<sub>2</sub> -perovskite interface lead to a large potential loss and performance variation in the resulting photovoltaic devices. Here, a novel SnO<sub>2</sub> -in-polymer matrix (i.e., polyethylene glycol) is devised as the electron transporting layer to improve the film quality of the SnO<sub>2</sub> electron transporting layer. The SnO<sub>2</sub> -in-polymer matrix is fabricated through spin-coating a polymer-incorporated SnO<sub>2</sub> colloidal ink. The polymer is uniformly dispersed in SnO<sub>2</sub> colloidal ink and promotes the nanoparticle disaggregation in the ink. Owing to polymer incorporation, the compactness and wetting property of SnO<sub>2</sub> layer is significantly ameliorated. Finally, photovoltaic devices based on Cs<sub>0.05</sub> FA<sub>0.81</sub> MA<sub>0.14</sub> PbI<sub>2.55</sub> Br<sub>0.45</sub> perovskite sandwiched between SnO<sub>2</sub> and Spiro-OMeTAD layer are fabricated. Compared with the averaging power conversion efficiency of 16.2% with 1.2% deviation for control devices, the optimized devices exhibit an improved averaging efficiency of 19.5% with 0.25% deviation. The conception of polymer incorporation in the electron transporting layer paves a way to further increase the performance of planar perovskite solar cells.